To disable the 2 Step Security:

On your profile click on ‘Settings & Privacy’, next click on ‘View the security centre’.

From here you’ll be able to choose the bottom option which is:

‘2 Step Verification Settings’ Click on this link and you’ll be taken to the option to Disable this feature.

BUT it is HIGHLY Recommended that you leave this feature ON, this is because of the amount of accounts that can be easily hacked into.